hdf5_ep

[svn-r8389] Purpose: Bug fix and warning

Description:
Fixed bug in H5TB_less().  It was returning the next largest node,
instead of the next smallest as advertised.

Added comments warning that H5TB_rem()s will occasionally delete a
node other than the one provided in its argument list.

Solution:
It was sufficient t invert two comparisons in H5TB_less().

Platforms tested:
h5committested